Iron is critical for blood and muscle cell development, production of hemoglobin, and a healthy immune system. The amount of blood in your body increases by about 50% when pregnant so you need more iron to make more hemoglobin, the protein in red blood cells that carries oxygen to other cells. About half of pregnant women are iron deficient which can lead to anemia. Iron is crucial for fertility as well. Studies have shown that women who do not get sufficient amounts of iron may suffer anovulation (lack of ovulation) and possibly poor egg health, which can inhibit pregnancy. Best Sources: Wild game meat, grass-fed beef, lentils, spinach, sesame seeds, beans, pumpkin seeds (raw). **Note that many vegetables like spinach have a lot of non-heme iron, which is absorbed less by the body. Eating vitamin-C rich foods with iron improves iron absorbtion.